Following Denmark's defeat by the Austro-Prussian army, Als became part of Prussia and later Germany until the referendum of 1920.
In addition, Clausen believed that it would minimize the risk of future conflict if the future border in the marshy West Schleswig followed either the Vidå river or a dyke.
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Since a Danish majority in this zone was produced in only three small villages on the island of Föhr, none of which were aligned with the coming border, the Commission Internationale de Surveillance du Plébiscite au Slesvig decided on a line almost identical to the border between the two zones.
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